Swift Transportation Company is a transportation services company and a truckload carrier in North America. The Company operates in three segments: Truckload, Dedicated and Intermodal. As of December 31, 2012, the Company operated a tractor fleet of approximately 15,300 units comprised of 11,300 tractors driven by company drivers and 4,000 owner-operator tractors, a fleet of 52,800 trailers, and 8,700 intermodal containers from 35 major terminals positioned near major freight centers and traffic lanes in the United States and Mexico. During the year ended December 31, 2012, its tractors covered 1.6 billion miles for shippers throughout North America. In the Company's trucking operations, it principally operates in short-to-medium-haul traffic lanes around its terminals or dedicated customer locations.